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047092ffe2
misc.c was getting a little large, move two of the UNC parsing relating functions to a new C file unc.c which makes the coding of the upcoming witness protocol patch series a little cleaner as well. Suggested-by: Rafal Szczesniak <rafal@elbingbrewery.org> Reviewed-by: Aurelien Aptel <aaptel@suse.com> Signed-off-by: Steve French <stfrench@microsoft.com>
68 lines
1.4 KiB
C
68 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2020, Microsoft Corporation.
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*
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* Author(s): Steve French <stfrench@microsoft.com>
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* Suresh Jayaraman <sjayaraman@suse.de>
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* Jeff Layton <jlayton@kernel.org>
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*/
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#include <linux/slab.h>
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#include "cifsproto.h"
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/* extract the host portion of the UNC string */
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char *extract_hostname(const char *unc)
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{
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const char *src;
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char *dst, *delim;
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unsigned int len;
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/* skip double chars at beginning of string */
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/* BB: check validity of these bytes? */
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if (strlen(unc) < 3)
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return ERR_PTR(-EINVAL);
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for (src = unc; *src && *src == '\\'; src++)
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;
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if (!*src)
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return ERR_PTR(-EINVAL);
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/* delimiter between hostname and sharename is always '\\' now */
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delim = strchr(src, '\\');
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if (!delim)
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return ERR_PTR(-EINVAL);
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len = delim - src;
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dst = kmalloc((len + 1), GFP_KERNEL);
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if (dst == NULL)
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return ERR_PTR(-ENOMEM);
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memcpy(dst, src, len);
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dst[len] = '\0';
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return dst;
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}
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char *extract_sharename(const char *unc)
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{
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const char *src;
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char *delim, *dst;
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int len;
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/* skip double chars at the beginning */
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src = unc + 2;
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/* share name is always preceded by '\\' now */
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delim = strchr(src, '\\');
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if (!delim)
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return ERR_PTR(-EINVAL);
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delim++;
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len = strlen(delim);
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/* caller has to free the memory */
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dst = kstrndup(delim, len, GFP_KERNEL);
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if (!dst)
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return ERR_PTR(-ENOMEM);
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return dst;
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}
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